Solid state equilibrium in the doubly substituted (TI, Pb)(Sr, Ba)O3 system

Abstract The phase relations in the doubly substituted Tl x Pb 1− x Sr y Ba 1− y O 3 system show a solubility range of the perovskite phase BaPbO 3 from x =0, y =0.5 to x =0.8, y =0. The crystallographic structure of the solid solution is well described with a tetragonal cell, I 4/ mcm space group. The electrical conductivity shows a semiconducting behaviour with an activation energy of 7.2 kJ mol − in the temperature range 600–850°C. The Sr-based perovskite SrPbO 3 , with orthorhombic Pbnm structure does not accept extended Tl or Ba substitutions.